Temp question

Molleigh • Wife💕mom to Addy Rae🎀

My two month old had a fever it started at 100.3(rectal) then went to 100.6 (armpit)then it dropped on its own and she’s at 98.4-98.6... I called her pediatrician and he’s old so I can’t really understand wtf he wants sometimes. But he said if the temp gets that high to take her to the er, to watch her temp really close today. Since it’s back to normal do I still take her to the er?? Any experiences?? I’m a ftm I need help! Is she okay bc she’s back to normal?